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https://github.com/servo/servo.git
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Dispatch touch events and perform default touch actions.
This is currently limited to simple single-touch actions. It does not include momentum scrolling or pinch zooming.
This commit is contained in:
Matt Brubeck
parent
4ed15a8853
commit
fe7460f34d
9 changed files with 276 additions and 15 deletions
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@ -26,7 +26,7 @@ use layers::rendergl;
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use layers::rendergl::RenderContext;
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use layers::scene::Scene;
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use layout_traits::LayoutControlChan;
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use msg::compositor_msg::{Epoch, FrameTreeId, LayerId, LayerKind};
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use msg::compositor_msg::{Epoch, EventResult, FrameTreeId, LayerId, LayerKind};
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use msg::compositor_msg::{LayerProperties, ScrollPolicy};
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use msg::constellation_msg::Msg as ConstellationMsg;
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use msg::constellation_msg::{AnimationState, Image, PixelFormat};
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@ -35,7 +35,8 @@ use msg::constellation_msg::{NavigationDirection, PipelineId, WindowSizeData};
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use pipeline::CompositionPipeline;
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use profile_traits::mem::{self, ReportKind, Reporter, ReporterRequest};
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use profile_traits::time::{self, ProfilerCategory, profile};
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use script_traits::{ConstellationControlMsg, LayoutControlMsg};
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use script_traits::CompositorEvent::{TouchDownEvent, TouchMoveEvent, TouchUpEvent};
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use script_traits::{ConstellationControlMsg, LayoutControlMsg, MouseButton};
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use scrolling::ScrollingTimerProxy;
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use std::collections::hash_map::Entry::{Occupied, Vacant};
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use std::collections::{HashMap, HashSet};
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@ -59,6 +60,9 @@ const BUFFER_MAP_SIZE: usize = 10000000;
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const MAX_ZOOM: f32 = 8.0;
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const MIN_ZOOM: f32 = 0.1;
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/// Minimum number of ScreenPx to begin touch scrolling.
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const TOUCH_PAN_MIN_SCREEN_PX: f32 = 20.0;
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/// Holds the state when running reftests that determines when it is
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/// safe to save the output image.
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#[derive(Copy, Clone, PartialEq)]
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@ -68,6 +72,23 @@ enum ReadyState {
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ReadyToSaveImage,
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}
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/// The states of the touch input state machine.
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///
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/// TODO: Currently Add support for "flinging" (scrolling inertia), pinch zooming, better
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/// support for multiple touch points.
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enum TouchState {
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/// Not tracking any touch point
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Nothing,
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/// A touchstart event was dispatched to the page, but the response wasn't received yet.
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WaitingForScript,
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/// Script is consuming the current touch point; don't perform default actions.
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DefaultPrevented,
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/// A single touch point is active and may perform click or pan default actions.
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Touching,
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/// A single touch point is active and has started panning.
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Panning,
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}
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/// NB: Never block on the constellation, because sometimes the constellation blocks on us.
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pub struct IOCompositor<Window: WindowMethods> {
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/// The application window.
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@ -156,6 +177,15 @@ pub struct IOCompositor<Window: WindowMethods> {
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/// Pending scroll to fragment event, if any
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fragment_point: Option<Point2D<f32>>,
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/// Touch input state machine
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touch_gesture_state: TouchState,
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/// When tracking a touch for gesture detection, the point where it started
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first_touch_point: Option<TypedPoint2D<DevicePixel, f32>>,
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/// When tracking a touch for gesture detection, its most recent point
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last_touch_point: Option<TypedPoint2D<DevicePixel, f32>>,
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/// Pending scroll events.
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pending_scroll_events: Vec<ScrollEvent>,
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@ -295,6 +325,9 @@ impl<Window: WindowMethods> IOCompositor<Window> {
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channel_to_self: state.sender.clone_compositor_proxy(),
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scrolling_timer: ScrollingTimerProxy::new(state.sender),
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composition_request: CompositionRequest::NoCompositingNecessary,
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touch_gesture_state: TouchState::Nothing,
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first_touch_point: None,
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last_touch_point: None,
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pending_scroll_events: Vec::new(),
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composite_target: composite_target,
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shutdown_state: ShutdownState::NotShuttingDown,
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@ -502,6 +535,18 @@ impl<Window: WindowMethods> IOCompositor<Window> {
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}
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}
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(Msg::TouchEventProcessed(result), ShutdownState::NotShuttingDown) => {
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match self.touch_gesture_state {
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TouchState::WaitingForScript => {
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self.touch_gesture_state = match result {
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EventResult::DefaultAllowed => TouchState::Touching,
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EventResult::DefaultPrevented => TouchState::DefaultPrevented,
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};
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}
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_ => {}
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}
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}
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(Msg::SetCursor(cursor), ShutdownState::NotShuttingDown) => {
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self.window.set_cursor(cursor)
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}
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@ -1097,6 +1142,109 @@ impl<Window: WindowMethods> IOCompositor<Window> {
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}
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}
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fn on_touch_down(&mut self, identifier: i32, point: TypedPoint2D<DevicePixel, f32>) {
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match self.touch_gesture_state {
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TouchState::Nothing => {
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// TODO: Don't wait for script if we know the page has no touch event listeners.
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self.first_touch_point = Some(point);
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self.last_touch_point = Some(point);
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self.touch_gesture_state = TouchState::WaitingForScript;
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}
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TouchState::WaitingForScript => {
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// TODO: Queue events while waiting for script?
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}
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TouchState::DefaultPrevented => {}
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TouchState::Touching => {}
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TouchState::Panning => {}
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}
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if let Some(result) = self.find_topmost_layer_at_point(point / self.scene.scale) {
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result.layer.send_event(self, TouchDownEvent(identifier, result.point.to_untyped()));
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}
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}
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fn on_touch_move(&mut self, identifier: i32, point: TypedPoint2D<DevicePixel, f32>) {
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match self.touch_gesture_state {
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TouchState::Nothing => warn!("Got unexpected touch move event"),
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TouchState::WaitingForScript => {
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// TODO: Queue events while waiting for script?
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}
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TouchState::Touching => {
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match self.first_touch_point {
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Some(p0) => {
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let delta = point - p0;
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let px: TypedPoint2D<ScreenPx, _> = delta / self.device_pixels_per_screen_px();
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let px = px.to_untyped();
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if px.x.abs() > TOUCH_PAN_MIN_SCREEN_PX ||
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px.y.abs() > TOUCH_PAN_MIN_SCREEN_PX
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{
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self.touch_gesture_state = TouchState::Panning;
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self.on_scroll_window_event(delta, point.cast().unwrap());
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}
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}
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None => warn!("first_touch_point not set")
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}
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}
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TouchState::Panning => {
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match self.last_touch_point {
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Some(p0) => {
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let delta = point - p0;
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self.on_scroll_window_event(delta, point.cast().unwrap());
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}
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None => warn!("last_touch_point not set")
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}
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}
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TouchState::DefaultPrevented => {
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// Send the event to script.
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if let Some(result) = self.find_topmost_layer_at_point(point / self.scene.scale) {
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result.layer.send_event(self,
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TouchMoveEvent(identifier, result.point.to_untyped()));
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}
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}
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}
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self.last_touch_point = Some(point);
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}
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fn on_touch_up(&mut self, identifier: i32, point: TypedPoint2D<DevicePixel, f32>) {
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// TODO: Track the number of active touch points, and don't reset stuff until it is zero.
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self.first_touch_point = None;
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self.last_touch_point = None;
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// Send the event to script.
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if let Some(result) = self.find_topmost_layer_at_point(point / self.scene.scale) {
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result.layer.send_event(self, TouchUpEvent(identifier, result.point.to_untyped()));
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}
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match self.touch_gesture_state {
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TouchState::Nothing => warn!("Got unexpected touch up event"),
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TouchState::WaitingForScript => {}
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TouchState::Touching => {
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// TODO: If the duration exceeds some threshold, send a contextmenu event instead.
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// TODO: Don't send a click if preventDefault is called on the touchend event.
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self.simulate_mouse_click(point);
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}
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TouchState::Panning => {}
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TouchState::DefaultPrevented => {}
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}
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self.touch_gesture_state = TouchState::Nothing;
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}
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/// http://w3c.github.io/touch-events/#mouse-events
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fn simulate_mouse_click(&self, p: TypedPoint2D<DevicePixel, f32>) {
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match self.find_topmost_layer_at_point(p / self.scene.scale) {
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Some(HitTestResult { layer, point }) => {
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let button = MouseButton::Left;
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layer.send_mouse_move_event(self, point);
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layer.send_mouse_event(self, MouseWindowEvent::MouseDown(button, p), point);
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layer.send_mouse_event(self, MouseWindowEvent::MouseUp(button, p), point);
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layer.send_mouse_event(self, MouseWindowEvent::Click(button, p), point);
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}
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None => {},
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}
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}
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fn on_scroll_window_event(&mut self,
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delta: TypedPoint2D<DevicePixel, f32>,
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cursor: TypedPoint2D<DevicePixel, i32>) {
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